KR100562917B1 - Deflection Yoke for Color CRT - Google Patents

Abstract

The present invention relates to a deflection yoke for a color cathode ray tube. The deflection yoke for the color cathode ray tube of the present invention includes a panel having a phosphor screen formed on its inner surface, a funnel coupled to the panel, an electron gun mounted on the funnel to emit an electron beam, and a vertical and horizontal deflection coil for deflecting the electron beam emitted from the electron gun. In the color cathode ray tube including the formed deflection yoke and a shadow mask for color-selecting the electron beam emitted from the electron gun, the upper and lower ends of the opening of the deflection yoke are 3/4 to 4/4 of the diameter of the opening of the horizontal deflection coil. A magnet having a transverse length A of 3 or less is formed.

Collar, Cathode Ray Tube, Deflection Yoke, Horizontal Deflection Coil, Magnet

Description

Deflection yoke for color cathode ray tube {Deflection Yoke for Color CRT}

1 is a schematic view of a typical cathode ray tube.

2 is a schematic view of a conventional deflection yoke.

3 is a circuit diagram of a horizontal deflection coil for horizontally deflecting an electron beam;

4 is a magnetic force line distribution diagram according to a magnet arrangement of a conventional deflection yoke.

Fig. 5 is a diagram showing an example of misconvergence changed by the utilization of a conventional magnet.

6 is a diagram showing an example of a change in the pin (Pin) changes by the utilization of the conventional magnet.

Figure 7 is a view showing a pin correction magnet mounted to the deflection yoke for the color cathode ray tube according to an embodiment of the present invention.

8 illustrates a magnet according to an embodiment of the present invention.

9 is a magnetic field distribution diagram of the magnet arrangement of the deflection yoke for the color cathode ray tube according to the embodiment of the present invention.

10 is a view showing another example of a magnet in the deflection yoke for the color cathode ray tube according to the embodiment of the present invention;

*** Explanation of symbols for the main parts of the drawing ***

1 panel 6: deflection yoke

61: vertical deflection coil 62: horizontal deflection coil

67: magnet W: diameter of the horizontal deflection coil

The present invention relates to a color cathode ray tube including a deflection yoke having a saddle-type deflection coil, and more particularly, to a display on a cathode ray tube by changing the size and number of upper and lower pin correction magnets of an opening of a deflection yoke. By changing the beam arrangement of the displayed screen, the shadow mask curvature of the cathode ray tube can be advantageously designed to improve the drop characteristics of the cathode ray tube, and the left and right pin characteristics can be changed into a ball magnetic field. It is related with the deflection yoke for color cathode ray tubes which can be performed.

In general, a color cathode ray tube uses an in-line electron gun, and in the cathode ray tube using the in-line electron gun, red (R), green (G), and blue (B) electron beams are arranged side by side horizontally. Therefore, in order to converge the three electron beams at one point of the fluorescent surface, the deflection yoke of the cathode ray tube adopts self-converging using a non-uniform magnetic field.

As shown in FIG. 1, the color cathode ray tube has a panel 1 mounted on the front surface of the cathode ray tube and a phosphor of red (R), green (G), and blue (B) on the inner surface of the panel 1. And a shadow mask 4 having a color discriminating function of the electron beam 10 incident on the fluorescent surface 3 behind the fluorescent surface 3, and a rear surface of the panel 1. And a funnel 2 mounted to maintain the interior in a vacuum state, an electron gun 5 and the funnel mounted inside the tubular neck portion retracted to the rear of the funnel 2 to launch the electron beam 10. It consists of a deflection yoke 6 which surrounds the outside of 2) and is installed to deflect the electron beam 10 in the horizontal or vertical direction.

In particular, the deflection yoke 6 vertically aligns the electric electron beam with a pair of horizontal deflection coils 61 for horizontally deflecting the electron beam 10 emitted from the electric electron gun 5 inside the cathode ray tube as shown in FIG. 2. Conical ferrite used to improve the deflection efficiency by reducing the loss of magnetic force generated by the pair of vertical deflection coils 62 and the current flowing through the horizontal and vertical deflection coils 61 and 62 to deflect in the direction. The core 64, the horizontal deflection coil 61, the vertical deflection coil 62 and the ferrite core 64, while determining the mechanical relative position, such as fixed and coupled mechanically, the horizontal deflection coil ( 61) and a holder (63), which serves to insulate between the vertical deflection coil (62) and the neck (Neck) side of the holder (63), which is mainly generated by a vertical barrel type magnetic field. To improve comma aberration COMA Free Coil (65), Ring Band (66) and deflection yoke openings provided at the neck end of holder (63) to mechanically couple cathode ray tube and deflection yoke (6). It is mounted on a cross arm mounted on the cross arm to correct the screen characteristics, and is composed of a beam 67 on the screen and a magnet 67 used to correct the R, G, and B beam characteristics.

In addition, the conventional deflection yoke 6 flows a current having a frequency of 15.75 KHz or higher to the horizontal deflection coil 61, and deflects the electron beam inside the cathode ray tube in the horizontal direction by using a magnetic field generated accordingly. A current having a frequency of 60 Hz is usually passed through the vertical deflection coil 62 to deflect the electron beam in the vertical direction by using a magnetic field generated accordingly.

In addition, the self-convergence-type deflection yoke enables the three electron beams to achieve convergence on the screen without using additional circuits and additional devices by using non-uniform magnetic fields by the horizontal 61 and vertical deflection coils 62. (6) is mainly being developed.

That is, by adjusting the winding distributions of the horizontal deflection coil 61 and the vertical deflection coil 62, each part (opening part, middle part, and neck part) is made into a barrel or pin-cushion type magnetic field. The electron beams experience different deflection forces according to their positions, so that they can be collected at the same point at different distances from the starting point of the electron beam to the screen of the arrival point.

In addition, when a current is applied to the horizontal and vertical deflection coils 61 and 62 to create a magnetic field, it is difficult to deflect the electron beam to the front of the screen only by the magnetic field generated by the horizontal and vertical deflection coils 61 and 62. 64), the magnetic field is increased by increasing the efficiency of the magnetic field by minimizing the loss on the return path of the magnetic field.

In addition, the pair of horizontal deflection coils comprises an upper horizontal deflection coil and a lower horizontal deflection coil formed in a saddle shape, and the upper and lower horizontal deflection coils 41 and 41 'are parallel to each other as shown in FIG. 3. After connecting, a horizontal deflection current having a sawtooth wave flows to form a pincushion-like horizontal deflection magnetic field.

When three electron beams, ie, three red, green, and blue beams, emitted from the electron gun 5 pass through the horizontal deflection magnetic field region, the force received by the Fleming's left-hand law is 3 of the distance between the inner surface of the horizontal deflection coil and the electron beam. It is deflected in the horizontal direction in inverse proportion to the power.

Conventionally, the beam arrangement is corrected by attaching the magnet 67 to the cross arm portion of the deflection yoke 6 for the cathode ray tube. When the electron beam 10 emitted from the electron gun is deflected to face forward. As shown in FIG. 4, the N pole of the upper magnet was placed on the left side from the front to make the -Bx magnetic field, and the magnetized to be located on the right side from the front of the S pole.

The magnet 67 installed in this way has an effect of disposing a magnetic force line as shown in FIG. 4 and changes the convergence characteristic displayed in the CRT.

That is, the deflected electron beam 10 moves to the left and right sides of the R-beam and B-beam according to the deflected angle as shown in FIG. Depending on the intensity of Gauss and the size of the magnet, different movement amounts and directions are obtained to obtain an appropriate amount of screen characteristics.

Therefore, when the pins on the left and right sides of the screen displayed as shown in FIG. 6 are corrected with the horizontal and vertical deflection coils 61 and 62 or other corrections without the chassis circuit of the deflection yoke as described above. The pin distortion phenomenon cannot be completely improved, and the beam arrangement is greatly changed at the corner portion of the screen, and the convergence characteristic cannot be completely solved.

Looking at the problems of the prior art, first, the shadow mask curvature of the cathode ray tube is inevitably changed and the curvature is changed when the pin amounts on the left and right sides of the screen displayed by horizontal and vertical deflection coils or other corrections are corrected. Even if the shadow mask design by using the drop test (Drop) test characteristics of the tube is disadvantageous. Such a problem is that as the screen curvature increases as the screen becomes flat and large in size, there is a problem in that poorer screen characteristics are provided to users who use CRT TVs or monitors.

Secondly, if the pins on the left and right sides of the screen displayed by horizontal and vertical deflection coils or other corrections are corrected, the corners and just below the corners, which are difficult screen characteristics in the yoke, are corrected. There is a problem that the convergence characteristic cannot be improved due to the vertical imbalance between the R (Red) beam and the B (Blue) beam.

Accordingly, an object of the present invention is conceived to solve the above problem, by adjusting the position or size of the magnet of the deflection yoke, the vertical direction between the R beam and the B beam of the corner portion and the portion immediately below the corner, which is a screen characteristic to be displayed An object of the present invention is to provide a deflection yoke for a color cathode ray tube with improved convergence characteristics due to an imbalance.

The deflection yoke for the color cathode ray tube of the present invention for achieving the above object is a panel having a phosphor screen formed on the inner surface, a funnel coupled to the panel, an electron gun mounted on the funnel to emit an electron beam, and an electron beam emitted from the electron gun A color cathode ray tube including a deflection yoke having vertical and horizontal deflection coils for deflecting a shadow, and a shadow mask for color-selecting an electron beam emitted from the electron gun, wherein the horizontal and upper ends of the openings of the deflection yoke A magnet having a transverse length A of 3/4 to 4/3 or less of the diameter of the opening of the deflection coil is formed.

According to this feature, the magnet is formed 10mm ~ 20mm spaced apart from the outermost top and bottom of the opening of the horizontal deflection coil.

According to this feature, the magnet has a length B of 5 mm to 15 mm.
According to this feature, the magnet has a height H of 5 mm to 15 mm.

According to this feature, the magnet is coupled to at least one magnet.
According to such a feature, the magnet is combined with two or more magnets of four or less.

According to this feature, when the magnet is viewed from the screen side to the neck side, the upper magnet is formed so that the right end is the N pole and the left end is the S pole, the lower magnet is the right end is the S pole and the left end is It is formed to be an N pole.

According to another aspect of the invention, the deflection yoke for the color cathode ray tube deflects a panel having a phosphor screen formed on its inner surface, a funnel coupled to the panel, an electron gun mounted on the funnel, and emitting an electron beam, and an electron beam emitted from the electron gun. In a color cathode ray tube including a deflection yoke having vertical and horizontal deflection coils, a horizontal length of 3/4 to 4/3 or less of an opening diameter of the horizontal deflection coil at an upper end and a lower end of the opening of the deflection yoke ( A magnet having A); It includes a shadow mask of AK material (Aluminum Killed) to perform the color selection of the electron beam emitted from the electron gun.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Generally, the deflection yoke 6 flows a current having a frequency of 15.75 KHz or higher to the horizontal deflection coil 61, and deflects the electron beam in the CRT horizontally by using a magnetic field generated therein, and also vertically. The deflection coil 62 is supplied with a current having a frequency of 60 Hz, and the electron beam is deflected in the vertical direction by using a magnetic field generated accordingly.

And by using the non-uniform magnetic field by the horizontal and vertical deflection coils (61, 62), the deflection yoke of the self-convergence type that allows three electron beams to achieve convergence on the screen even without using a separate additional circuit and additional device (6) is mainly being developed.

That is, the winding distribution of the horizontal deflection coil and the vertical deflection coil is formed to create a barrel or pin-cushion type magnetic field for each part (opening part, middle part, and neck part), and the three electron beams have different deflection forces according to their positions. This allows them to gather at the same point at different distances from the starting point of the electron beam to the screen of the arrival point.

In addition, in the case of making a magnetic field by flowing a current through the horizontal and vertical deflection coils 61 and 62, it is difficult to deflect the electron beam to the front of the screen only by the magnetic field by the coil. By minimizing the loss of the phase, the magnetic field is increased to increase the magnetic force.

Therefore, according to the present invention, by changing the attachment position and the size of the pin correction magnet 67 of the opening of the deflection yoke, not only the screen corner beam arrangement but also the center beam arrangement is changed so that the drop strength of the cathode ray tube is advantageous. The curvature of the mask can be designed so that when the pins on the left and right sides of the screen displayed by the horizontal and vertical deflection coils 61 and 62 or other corrections are corrected, the corner part, which is a screen characteristic that is difficult to correct in the deflection yoke 6 and The deflection yoke is configured to solve the convergence characteristic caused by the vertical imbalance between the R (Red) beam and the B (Blue) beam just below the corner.

On the other hand, the conventional magnet is formed as shown in Figure 2 by installing the magnet 67 insertion structure in the opening of the deflection yoke, the magnetic force lines are distributed as shown in Figure 4, but the magnetic force lines are not formed in the deflection yoke as a whole, the electron beam is also not fully deflected. As a result, the screen characteristics could not be improved, and in addition, the miss landing phenomenon caused by the beam array change could occur.

Accordingly, in the present invention, as shown in FIG. 8, the cross length A of the magnet is formed to be 3/4 or more and 4/3 or less of the opening diameter W of the horizontal deflection coil, and is attached to the opening holder of the deflection yoke. To form. As such, when the transverse length A of the magnet is formed to be greater than 3/4 of the opening diameter of the horizontal deflection coil, as shown in FIG. 9, the magnetic force line distribution of -Bx is formed to be wider than the conventional magnetic force line distribution, and thus the pin of the screen Allow you to adjust the amount of (Pin). On the other hand, when the transverse length A of the magnet is 4/3 or more of the opening diameter W of the horizontal deflection coil, the change in the corner beam arrangement is more increased than the change in the center beam arrangement, resulting in poor screen characteristics.

In addition, the cross arm portion affects a part of the magnetic field, and thus the effect of providing the magnet according to the present invention is better.

The magnet is preferably attached 10 to 20 mm apart from the upper and lowermost outermost opening of the horizontal deflection coil of the deflection yoke, if formed in the cross-arm portion as in the prior art the distribution of the line of magnetic force is horizontal Since it does not occur to the cross arm side of the deflection coil, an area which does not deflect the electron beam is generated, so that it is formed to be spaced about 10 to 20 mm apart.

Meanwhile, as shown in FIG. 8, the length B of the magnet is 5 to 15 mm, and the height H is 5 to 15 mm.

If the magnet longitudinal length (B) and height (H) is smaller than 5 mm, it is difficult to generate magnetic force lines of the north pole and the south pole. If the magnet longitudinal length and height is larger than 15 mm, it is attached to the deflection yoke opening and assembled in the cathode ray tube. Since it becomes difficult at the time, the length and height of the magnet is formed smaller than 15mm.

The magnet according to the present invention has the screen characteristic corrected by the screen characteristic correction magnet 67 mounted on the cross arm attached to the opening holder of the deflection yoke 6, and the electron beam 10 emitted from the electron gun is upward. When the N pole of the magnet is viewed from the screen side to the neck side so that it can be deflected by creating a -Bx magnetic field, the upper pin correction magnet is formed so that the right end is the N pole and the left end is the S pole, and the lower pin correction magnet is The right end is S pole, and the left end is N pole.

Therefore, the magnet 67 formed as described above has a distribution of pin-cushion type magnetic force lines made by the R and B electron beams in the horizontal direction at 12 o'clock and changes the misconvergence of the horizontal direction (commonly referred to as YBH). At the same time, the horizontal and vertical misconvergence of the R and B electron beams (commonly referred to as CBH and CCV) also changes in the 2 o'clock of the screen. In addition, the position of the G-beam relative to the R-beam or B-beam of the corner portion which is hard to change when the beam array is changed in the cathode ray tube or the electron gun is changed to compensate for the misconvergence of the entire screen.

Meanwhile, when the three electron beams B, G, and R beams are viewed as a group, as shown in FIG. 9, the group is gradually separated from the other three electron beams B, G, and R beam groups located in the next column. Degroup phenomenon is known, but the above-mentioned degroup phenomenon is remarkably generated. However, when the magnet according to the present invention is used, the degroup phenomenon is less than 10%, so the beam arrangement is also improved.

In another embodiment of the present invention, when the magnet for beam array correction is magnetized to two or more magnets, the range of magnetic force lines becomes wider as shown in FIG.

The shadow mask is preferably an AK mask (Aluminium Killed) mask, AK mask mask is better than the conventional Invar (Drop) mask characteristics (Drop) characteristics can be more effectively managed beam arrangement Because there is.

Therefore, according to the present invention, by changing the attachment position and size of the pin correction magnet of the opening of the deflection yoke, the mask curvature so that the drop strength of the tube is advantageous by changing the beam arrangement at the center as well as the beam arrangement at the corner of the screen. When the pins on the left and right sides of the screen, which can be designed and displayed by horizontal and vertical deflection coils or other corrections, are corrected, the corners and just below the corners, which are difficult screen characteristics in the deflection yoke, are corrected. It is possible to solve the convergence characteristic due to the vertical imbalance between the R (RED) beam and the B (BLUE) beam.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

Therefore, according to the present invention, by forming the transverse length A of the magnet to 3/4 or more of the diameter of the horizontal deflection coil, the pin and misconvergence in the displayed screen are compensated for, and R, G In addition, it prevents the degroup phenomenon, which is the group position between the B beams, and replaces the pin compensation chassis circuit in the chassis itself, thereby reducing the cost.

Claims (11)

A deflection yoke having a panel having a phosphor screen formed on an inner surface thereof, a funnel coupled to the panel, an electron gun mounted to the funnel to emit an electron beam, and a vertical and horizontal deflection coil for deflecting the electron beam emitted from the electron gun; In the color cathode ray tube comprising a shadow mask for color-selection of the electron beam emitted from the electron gun, A deflection yoke for color cathode ray tubes, characterized in that a magnet having a transverse length (A) of 3/4 to 4/3 or less of the opening diameter of the horizontal deflection coil is formed at the top and bottom of the opening of the deflection yoke. delete The method of claim 1, The magnet is a deflection yoke for the color cathode ray tube, characterized in that formed 10mm ~ 20mm spaced apart from the outermost top and bottom of the opening of the horizontal deflection coil. delete The method of claim 1, The magnet is a deflection yoke for a color cathode ray tube, characterized in that the vertical length (B) is 5mm ~ 15mm. The method of claim 1, The magnet is a deflection yoke for a color cathode ray tube, characterized in that the height (H) is 5mm ~ 15mm. The method of claim 1, The magnet is a deflection yoke for the color cathode ray tube, characterized in that at least one magnet is coupled. The method of claim 7, wherein The magnet is a deflection yoke for color cathode ray tube, characterized in that more than two magnets less than four. The method of claim 1, When the magnet is viewed from the screen side to the neck side, the upper magnet is formed so that the right end is N pole and the left end is S pole, The lower magnet has a deflection yoke for a color cathode ray tube, characterized in that the right end is S pole and the left end is N pole. delete A panel having a phosphor screen formed on its inner surface, a funnel coupled to the panel, an electron gun mounted to the funnel to emit an electron beam, and a deflection yoke in which vertical and horizontal deflection coils are formed to deflect the electron beam emitted from the electron gun. In the color cathode ray tube, A magnet having a transverse length (A) of 3/4 to 4/3 or less of an opening diameter of the horizontal deflection coil at upper and lower ends of the opening of the deflection yoke; A deflection yoke for a color cathode ray tube, characterized in that it comprises a shadow mask of AK material (Aluminum Killed) to perform the color selection of the electron beam emitted from the electron gun.

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